Time for new tires on the boat trailer ---- tandem axle with Goodyear Workhorse Rib 9. 50 x 16. 5 load range E bias ply tires. I've been looking for the exact replacement tires but they are hard to find, long lead time, and $170-$190 per tire. Cooper also has a similar tire for the same price as well as a radial version, same load rating, for $120-130 range. Any input on radial vs bias ply tires in this size?